STAAR Science Practice Questions - State Of Texas Assessments Of Academic Readiness (STAAR) Science Exam

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A graph shows that a pond's dissolved oxygen drops sharply after a large amount of fertilizer washes into it. Which evidence would most directly support the explanation that algae growth caused the oxygen drop?

The pond water became colder after the storm Algae coverage increased greatly before the dissolved oxygen reached its lowest level The pond's depth stayed the same during the week Fish were seen near the surface after oxygen levels were already low

Correct Answer:

Algae coverage increased greatly before the dissolved oxygen reached its lowest level

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